actor Main
  new create(env: Env) =>
    var womb = recover iso Wombat("My wombat") end
    var obj = consumeWombat(consume womb)
    env.out.print(obj.hunger().string())

  fun consumeWombat(a: Wombat iso): Wombat iso =>
    a.set_hunger(3)
    consume a

class Wombat
  let name: String
  var _hunger_level: U64
  var _thirst_level: U64 = 1

  new create(name': String) =>
    name = name'
    _hunger_level = 0

  new hungry(name': String, hunger': U64) =>
    name = name'
    _hunger_level = hunger'

  fun hunger(): U64 => _hunger_level

  fun ref set_hunger(to: U64 = 0): U64 => _hunger_level = to